Refactor packages in pg-index-health-core

[mfvanek]

Part of #465

1. Package io.github.mfvanek.pg.checks.host was renamed to io.github.mfvanek.pg.core.checks.host
2. Package io.github.mfvanek.pg.checks.extractors was renamed to io.github.mfvanek.pg.core.checks.extractors
3. Package io.github.mfvanek.pg.utils was renamed to io.github.mfvanek.pg.core.utils
4. Package io.github.mfvanek.pg.common.maintenance was renamed to io.github.mfvanek.pg.core.checks.common
5. Package io.github.mfvanek.pg.settings was renamed to io.github.mfvanek.pg.core.settings
6. Package io.github.mfvanek.pg.statistics was renamed to io.github.mfvanek.pg.core.statistics

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (210b020) to head (e265472).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #505   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity      1054      1054           
===========================================
  Files            166       166           
  Lines           2239      2239           
  Branches         152       152           
===========================================
  Hits            2239      2239           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests